thinking about this a little, couldn't i just grab the id from the person who posted a message on our boards?

first create a new field for their profile to accept the adsense or yahoo pub id.

then in the post see who posted the message grab that new field if they are that person, and display their ad code 50% of the time, the other 50% would be my code.

so we could do a little

random thing on the page?